Eminem vs. Justin Bieber, 'Shady XV' Twitter Fans Mock New Bleached Platinum Blonde Hair [PHOTOS]: Will Ex-Girlfriend Selena Gomez Also 'Hate' Comeback Look?

Guess who's back.

Justin Bieber... with bleached platinum blonde hair (think old school Eminem).

The 20-year-old "Beauty and a Beat" crooner has yet to "officially" debut his new 'do via Instagram, but Twitter fans are already heckling the Biebs for trying to look like the infamous "Rap God." Check out some of the social media backlash:

@chloebieber0: "Justin be like throwback Thursday is too hype ima bring back my Eminem hair in Friday."

@brittanyericaa: "YOU'RE NOT EMINEM. PUT THE SANDY BLONDE BACK RIGHT NOW! @justinbieber."

@AbbeysKidrauhl: "So Justin's eminem again I take it... Oh Hey I'm Justin Bieber and when I'm bored I like to bleach my hair and pretend I'm Eminem just like when I was 12."

@biebftmatt: "@justinbieber what happened to not being eminem?"

@Godsgirlbieber9: "First of all its not yet summer second you're not eminem bae third RIP to your hair Justin."

@summervallender: "If Justin's bringing back his eminem stage he needs to reevaluate."

@Nope_Kidrauhl: "IM CRYING THE CORSE OF THE UNIVERSE IS NOW CHANGED HES TRYING TO BE EMINEM AGAIN."

@SHADYSLEGACY: "Justin wanna be Eminem so bad."

@RAUHLDRUGZ: "Yeah show us your new eminem hair #JustinWeNeedASelfieOfYourNewHair."

@kxxrenxx: "What is up with Justin's hair! No bro! You dont get to do that! don't try to be Eminem!"

Snapshots of Bieber's revamped, "bada$$" look are currently going viral online (via Daily Mail). The singer tried hidding his new makeover while leaving a West Hollywood hair salon on Thursday (December 4). Well, that didn't work. He walked-in brunette, and came out a LOT lighter.

The pop megastar went through this stage before... and he seems to like it:

justinbieber: "Throwback with me and @ryanbutler lol I thought I was eminem died my hair blonde every summer."

Apparently, the tradition carried on for years...

Funny, it's not even summertime!

Most #Stans AND Beliebers don't approve.

But wonder if (ex) girlfriend Selena Gomez digs the Slim Shady look-alike?

Time for the Detroit emcee to come out with another epic diss track, perhaps...

Should the Biebs stop messing with his look, MstarsNews readers? Sound-off in the comments section below!